theres another input file which has only valid route nos. Say there are 2 lakh records in this file

Route1
Route2
Route5
Route9

In my output i want only the records from first file which have valid route nos. Can this be achieved using SPLICE , keeping in view that 2nd file has 2 lakh valid route nos.though we can use INCLUDE COND , but as there are many records in 2nd file is it possible to use SPLICE or any other option.

Both files are FB , Rec length is 80. For File 1 the first field is user name , it's of length 15 , then route nos which starts from 16th position and is of length 20 , then there are other data till 80th pos.

For File 2 , there's only 1 field. It starts from 1 and is of length 20.